[MilkMaster122]

1985 ford mustang SVO
5 speed
1987 Thunderbird LA3 computer (5 speed)

im not getting any spark. and my fuel pump is not priming or running. the wires that go to it or not getting anything either. runs fine when connected directly to battery.

i used the wiring harness in my 1992 mustang LX for the swap. all wiring is done to book. perfect. no argument. car was running fine 2 days ago.

I replaced all relays and ignition switch is working. the black/white wire that has a 6V ref. is only putting out .07V and before it was exactly at 6.

were could my problem lay? the computer was just replaced with 20 miles on it. it was reman.

any ideas?

[hotcobra03]

Originally Posted by MilkMaster122

1985 ford mustang SVO
5 speed
1987 Thunderbird LA3 computer (5 speed)

im not getting any spark. and my fuel pump is not priming or running. the wires that go to it or not getting anything either. runs fine when connected directly to battery.

i used the wiring harness in my 1992 mustang LX for the swap. all wiring is done to book. perfect. no argument. car was running fine 2 days ago.

I replaced all relays and ignition switch is working. the black/white wire that has a 6V ref. is only putting out .07V and before it was exactly at 6.

were could my problem lay? the computer was just replaced with 20 miles on it. it was reman.

any ideas?

hey i had an 88tcoupe,,i do have a old ford manual for this time,along with a great wire diagram for 89-93...i was helping another guy with a problem.. i found out their was a change between 82-88/89-93 with the wire colors in harness and some changes on pcm,,its like its in the fine print..

i dont mind racking my brain for awile with this,,,can you bring me up to speed,,any pics that you can post will help also with me like being their?

the black and white wire you are testing,,is it for the tps?

[MilkMaster122]

thanks so much for the responce. this is my every day driver so its really hard without the car.

I will take some pics right now and have them up shortly.

yes the black/white wire is the TPS wire. As i said its only putting out .07V when its suppose to be 6V.

I used Stingerperformance.com's write-up on the wiring conversion and it was easy and straight forward.

[MilkMaster122]

so here are some pictures i snapped. the ignition side harness looks rough but its all soldered and wrapped.

[MilkMaster122]

alright so here is how i did this.

from my mustang it was a DIS with a coil.

this motor is distributed and the connectors needed to be rerouted and spliced.

here is how I went into the connector from the TOP.
Grey/Orange

tan

red/green (spiced into this wire and ran to the positive side of my blaster coil) twisted all remaining red/green wires together)

This wire I went directly to my starter syl. for a 12V ref.

tan/yellow (this i spliced into and went to my negative side of the coil

last one went to ground which was a foil wrapped wire.

I had it running on this setup but it wouldnt rev over 3000 and stalled ALOT.


The TPS picture I posted has that black wire that is suppost to be the 6v reference.

i also posted a picture of my VAM wires. they were rerouted from my old MAF sensor. and then the VAM also got the black./white wire also to make the 3rd out of the 4th pins.

[hotcobra03]

Originally Posted by MilkMaster122

alright so here is how i did this.

from my mustang it was a DIS with a coil.

this motor is distributed and the connectors needed to be rerouted and spliced.

here is how I went into the connector from the TOP.
Grey/Orange

tan

red/green (spiced into this wire and ran to the positive side of my blaster coil) twisted all remaining red/green wires together)

This wire I went directly to my starter syl. for a 12V ref.

tan/yellow (this i spliced into and went to my negative side of the coil

last one went to ground which was a foil wrapped wire.

I had it running on this setup but it wouldnt rev over 3000 and stalled ALOT.


The TPS picture I posted has that black wire that is suppost to be the 6v reference.

i also posted a picture of my VAM wires. they were rerouted from my old MAF sensor. and then the VAM also got the black./white wire also to make the 3rd out of the 4th pins.

ok 2 things ..1st doing a pic ck ..pics of paper book
http://i552.photobucket.com/albums/j...08-09_1256.jpg
http://i552.photobucket.com/albums/j...08-09_1254.jpg
http://i552.photobucket.com/albums/j...08-09_1253.jpg

2,,,car is a 1992 (what was orig motor,trans?) you are using a 1985 engine with garrett turbo?

than you are using a la3 pcm on a 92 harness...

what did the vam com off of ?


now it doesnt start...when you hooked up 12v and fuel pump came on did the car start?

[MilkMaster122]

thanks for the photos.

The orginal motor was a NA2.3L dual plug motor. im using the same trans.

i repined and rewired the NA harness for the LA3. stingerperformance.com has the write up I did.

and no the car didnt start because im getting no spark.

and the VAM is off of a 87 T-bird. which the computer is also.

This engine was running with this setup before with the previous owner.

[hotcobra03]

Originally Posted by MilkMaster122

thanks for the photos.

The orginal motor was a NA2.3L dual plug motor. im using the same trans.

i repined and rewired the NA harness for the LA3. stingerperformance.com has the write up I did.

and no the car didnt start because im getting no spark.

and the VAM is off of a 87 T-bird. which the computer is also.

This engine was running with this setup before with the previous owner.

your 3rd pic shows a plug with 3 wires...vam?

ok you are testing tps from,,pin 26 to 46 and you are looking for 4-6volts? than pin 46 to 47 for 1.0volt

also do you have fords pintest for no start? the first couple of test should find your problem?

[hotcobra03]

went to look in stingerperformance so i could follow...its a big site,,can you save me sometime and sent a link to your page you got info on?

[MilkMaster122]

the third picture is the connector for the TPS. its not the stock one. but it works perfect. .23V at closed throttle.

here is the link to the exact writeup i did
91-93 Mustang Turbo Swap Wiring Info

it is for the exact car I have, to the exact motor, tranny, and VAM

the last 2 pictures or the wires that go to my VAM. im not worried about those because i wired those straight to the computer to avoid complications.

and im not familar with fords no start pins. could you elaborate? I havnt done any "test" so to speak just found a whole bunch of wires that or not putting out the right voltage.

[hotcobra03]

Originally Posted by MilkMaster122

the third picture is the connector for the TPS. its not the stock one. but it works perfect. .23V at closed throttle.

here is the link to the exact writeup i did
91-93 Mustang Turbo Swap Wiring Info

it is for the exact car I have, to the exact motor, tranny, and VAM

the last 2 pictures or the wires that go to my VAM. im not worried about those because i wired those straight to the computer to avoid complications.

and im not familar with fords no start pins. could you elaborate? I havnt done any "test" so to speak just found a whole bunch of wires that or not putting out the right voltage.

ok ill go look in their,,, try and see if this is downloadable?

https://share.acrobat.com/adc/docume...e-432a6b78b24f

[MilkMaster122]

wow that file is going to be very helpful. I already know alot of the answers to these questions and here is what I got so far.

A1-no
A2-yes
A3-no
A4-no
C1-no
C2-yes
C3-yes
C4- this is were i get confused.
C4 CHECK FOR VPWR TO THE PCM PID
note: for 122 and 150 PCM harness conectors, VPWR PID can be accessed even though a fault exist.
Attempt to access the VPWR PID

how do I do this?

[hotcobra03]

ok,,got a bunch of questions...

1---what wire color do you have in pin #21? this answer will say if im on to something?



2nd==what type of tfi are you using? bolted to dizzy or fender?


3rd== what color is tfi? black or gray?


4th== what typr of tps? type c adjustable or fixed?


5th== in the last pic ,pcm...how many and what colors are the left over wires?


6==pic 4,,shows your fingers and 2 wires? to blurry cant see wire colors?


big question...i have found 3-4,maybe even 5 ,60 pin diagrams for 2.3 ,all having different setup...

do you have a link for what yours was,,just want to make sure before i answer,,

you said the old engine was a dual plug? if thats a 2.3 with 8 spark plugs,ive only seen one and it was in a ranger,,,

[MilkMaster122]

ok.

wire #21 is light blue/orange

my TFI is a Duralast autozone part. and it is mounted on the dizzy

the TFI is Grey.

the TPS is fixed. was putting out perfect voltage when car ran. I have an adjustable one but whenever I use it the voltage is way out of wack.

in the 4th pic there is actually 3 wires. ones hiding. the colors of the wires are
tan/blue
blue/purp
and Black
these wires were for my MAF but I use them for my VAM now. the 4th wire that goes to my VAM is the 6V refrence from the TPS brown/white wire

the leftover colors on my computer or:
orange/yellow
drk blue/yellow
gry/yellow
purp/yellow
Drk Green
tan/orange
purp/green
brown/pink
yellow/green
green/yellow
blue/orange

and how do I acess the VPOWER PID on the computer? im trying to go down this list because im expecting a short but I cant get past this step cause I have no idea what it is.

Thanks a million

[hotcobra03]

as you can see its from 2003..obd1 is mixed in their still,,...try these steps?

pin test C
C1
check vechile battery power circuit,,koeo test pin 37 of pcm to signal retun on the self test connector.

is voltage more than 10.5v

if yes goto C2..if no goto pintest B


C2 check vref voltage


koeo measure voltage between test pin 26 and 46 on pcm,

WHAT IS THE VOLTAGE?

more than 6.0v goto C4=ck for excess voltage on vref circuit
less than 4.0v goto C5=ck for shorted tps
between 4.0-6.0v goto C3=ck vref and signal return for continuity

test B

B1 is check battery voltage.

grater than 10.5..

yes goto B2

B2 ck eec ground to battery ground.
key off
measure resistance between test pin 40 at pcm to the test pin 60 on pcm,,than pin 40 on pcm to negative of battery post,,

ARE BOTH RESISTANCES LESS THAN 5 OHMS?


if yes you to B3,,if no fix open in eec ground..

B3..processor ground isolation...

key off
measure resistance between test pin 46 and pin 40..than pin 46 to pin 60,,on pcm

ARE BOTH RESISTANCES LESS THAN 5 OHMS?


if yes goto B4..if no replace pcm

start with these..


the wires hanging around pcm that have been pulled...

you pulled pin #8 DG/Y...is that hot when key comes on?

it was for fpm..goes to pin 5 on intergrated controler..and fuel pump..maybe it shorted out?
ChiltonLibrary.com - Authorization Error

the intergrated controller i didnt see in his swap..

my paper book show some base part #s

E7DF-12B577-CB is what it says for tbird,,,not sure if 92 is the same? any numbers on yours?